conodont

简明释义

英[ˈkəʊnədɒnt]美[ˈkoʊnəˌdɑːnt]

n. [古生] 牙形石；牙形刺；牙形虫

英英释义

单词用法

同义词

反义词

例句

1.We also concisely described the characteristics of the conodont fauna through the boundary strata.

本文对深海硅质岩系中这一界线地层牙形石动物群特征进行了简要的描述。

2.Based on an analysis of the conodont biofacies, it is inferred that there was probably a deep-sea basin facies sedimentary environment in the Wenguer area during the early Middle Permian.

通过牙形石生物相分析，推断温古尔地区中二叠世早期可能为盆地相较深水沉积环境。

3.Three failing periods of conodont are influenced by two ice ages, five sea-level changes and rainfalls in the geological history time.

三个衰退期受到地史时期中的二大冰期，五次海平面变化和大气降雨量的影响。

4.In the 1980s, however, paleontologists found full fossilized conodont specimens, and only recently have scientists begun to unravel their secrets.

不过，在20世纪80年代，古生物学者发现了完整的牙形刺化石标本，而直到最近科学家们才开始揭露出它们的秘密。

5.Based on an analysis of the conodont biofacies, it is inferred that there was probably a deep-sea basin facies sedimentary environment in the Wenguer area during the early Middle Permian.

通过牙形石生物相分析，推断温古尔地区中二叠世早期可能为盆地相较深水沉积环境。

6.Main production suitable for all kinds of electric bicycle, tricycles, use of lead-acid battery, its products conodont and midfielder two brands.

主要生产适合各种电动自行车、三轮车使用的铅酸、胶体蓄电池，旗下产品分武世、悍将两个品牌。

7.The soft anatomy of conodont shows some soft tissues including eyes, notochord, nerve cord, myomeres and caudal fin.

英国古生物学家们通过牙形石动物的软体解剖学研究，发现眼睛、脊索、神经索、肌肉组织、尾鳍等软组织；

8.A detailed research has been worked on the Late Upper Permian conodont fauna of Tieshikou section in Xinfeng area, Jiangxi Province.

对江西省信丰县铁石口剖面晚二叠世长兴阶至铁石口阶下部的牙形石动物群有了新的认识。

9.The morphology of conodont 牙形石 elements can vary significantly across different geological periods.

不同地质时期的牙形石元素的形态可以有显著差异。

10.The study of conodont 牙形石 fossils has provided significant insights into the evolution of early vertebrates.

对牙形石化石的研究为早期脊椎动物的进化提供了重要见解。

11.Paleontologists often use conodont 牙形石 as biostratigraphic markers to date rock layers.

古生物学家经常使用牙形石作为生物地层标志来确定岩层的年代。

12.The presence of conodont 牙形石 in sedimentary rocks indicates a marine environment.

沉积岩中牙形石的存在表明了海洋环境。

13.Researchers have discovered new species of conodont 牙形石 that lived during the Cambrian period.

研究人员发现了在寒武纪时期生活的新种牙形石。

作文

The study of ancient life forms is a fascinating field that allows scientists to piece together the history of our planet. One such intriguing group of organisms is the conodont, which are small, tooth-like fossils that date back to the Paleozoic era. These tiny structures, often just a few millimeters in size, provide significant insight into the evolutionary history of vertebrates. The term conodont derives from the Greek words 'conos', meaning 'cone', and 'odontos', meaning 'tooth', reflecting their unique shape. Conodonts are primarily known from their fossilized remains, which were first discovered in the late 19th century. Initially, these fossils were thought to be the teeth of some unknown fish, but further research revealed that they belonged to a distinct group of jawless vertebrates. This revelation has made conodont fossils crucial for understanding the early stages of vertebrate evolution. They serve as important biostratigraphic markers, helping geologists date rock layers and understand the environmental conditions of the time. One of the most remarkable aspects of conodont fossils is their abundance and wide geographical distribution. They can be found on every continent, making them valuable indicators of ancient marine environments. The diversity of conodont species throughout different geological periods also provides insights into the changes in marine ecosystems over millions of years. For example, the extinction event at the end of the Permian period is reflected in the fossil record of conodonts, showcasing how these organisms adapted to changing conditions. The morphology of conodonts is particularly interesting. Their tooth-like elements are composed of a unique substance called apatite, which is also found in the teeth and bones of modern vertebrates. This similarity suggests a deep evolutionary connection between conodonts and later jawed vertebrates. The study of their structure has led to various hypotheses about their feeding mechanisms and ecological roles. Some scientists propose that conodonts may have been filter feeders, while others suggest they were predators, preying on small marine organisms. In addition to their biological significance, conodonts have practical applications in geology and paleontology. Their presence in sedimentary rocks helps researchers reconstruct past environments and climate conditions. By analyzing the variations in conodont assemblages, scientists can infer shifts in sea level, temperature, and even oceanic circulation patterns. This information is invaluable for understanding the Earth's climatic history and predicting future changes. In conclusion, the conodont is more than just a fascinating fossil; it is a key to unlocking the mysteries of our planet's past. Through the study of these ancient organisms, we gain insights into the evolution of vertebrates, the dynamics of ancient ecosystems, and the geological processes that have shaped our world. The ongoing research into conodonts continues to reveal new information, reminding us of the complex interplay between life and the environment throughout Earth's history.

对古代生命形式的研究是一个迷人的领域，它使科学家能够拼凑出我们星球的历史。其中一个引人入胜的生物群体是conodont，它们是小型的牙齿状化石，追溯到古生代。这些微小的结构，通常只有几毫米大小，为脊椎动物的进化历史提供了重要的见解。术语conodont源自希腊词'conos'，意为'锥形'，以及'odontos'，意为'牙齿'，反映了它们独特的形状。conodont主要以其化石遗骸而闻名，这些化石首次在19世纪末被发现。最初，这些化石被认为是某种未知鱼类的牙齿，但进一步的研究揭示它们属于一种独特的无颌脊椎动物群体。这一发现使得conodont化石对于理解脊椎动物早期阶段的进化至关重要。它们作为重要的生物地层标志，帮助地质学家对岩层进行年代测定，并理解当时的环境条件。conodont化石最显著的特点之一是它们的丰度和广泛的地理分布。它们可以在每个大洲找到，使它们成为古代海洋环境的重要指示器。不同地质时期conodont物种的多样性也提供了关于数百万年来海洋生态系统变化的见解。例如，二叠纪末的灭绝事件在conodont化石记录中有所反映，展示了这些生物如何适应变化的条件。conodont的形态学尤其有趣。它们的牙齿状元素由一种名为磷灰石的独特物质组成，这种物质也存在于现代脊椎动物的牙齿和骨骼中。这种相似性表明了conodont与后来的有颌脊椎动物之间的深层进化联系。对它们结构的研究导致了关于其进食机制和生态角色的各种假设。一些科学家提出conodont可能是滤食者，而另一些则建议它们是捕食者，以小型海洋生物为食。除了生物学意义外，conodont在地质学和古生物学中也具有实际应用。它们在沉积岩中的存在帮助研究人员重建过去的环境和气候条件。通过分析conodont组合的变化，科学家可以推断海平面、温度甚至海洋环流模式的变化。这些信息对于理解地球的气候历史和预测未来变化是无价的。总之，conodont不仅仅是一个迷人的化石；它是解锁我们星球过去奥秘的关键。通过对这些古代生物的研究，我们获得了对脊椎动物进化、古代生态系统动态以及塑造我们世界的地质过程的见解。对conodont的持续研究不断揭示新的信息，提醒我们生命与环境之间在地球历史上复杂的相互作用。